linux-kernel - [PATCH 4.9 09/17] ACPI / PCI: Bail early in acpi_pci_add

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Date:   Tue,  7 Aug 2018 20:51:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vitaly Kuznetsov <vkuznets@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sinan Kaya <okaya@...nel.org>
Subject: [PATCH 4.9 09/17] ACPI / PCI: Bail early in acpi_pci_add_bus() if there is no ACPI handle

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vitaly Kuznetsov <vkuznets@...hat.com>

commit a0040c0145945d3bd203df8fa97f6dfa819f3f7d upstream.

Hyper-V instances support PCI pass-through which is implemented through PV
pci-hyperv driver. When a device is passed through, a new root PCI bus is
created in the guest. The bus sits on top of VMBus and has no associated
information in ACPI. acpi_pci_add_bus() in this case proceeds all the way
to acpi_evaluate_dsm(), which reports

  ACPI: \: failed to evaluate _DSM (0x1001)

While acpi_pci_slot_enumerate() and acpiphp_enumerate_slots() are protected
against ACPI_HANDLE() being NULL and do nothing, acpi_evaluate_dsm() is not
and gives us the error. It seems the correct fix is to not do anything in
acpi_pci_add_bus() in such cases.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Sinan Kaya <okaya@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/pci-acpi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -567,7 +567,7 @@ void acpi_pci_add_bus(struct pci_bus *bu
 	union acpi_object *obj;
 	struct pci_host_bridge *bridge;

-	if (acpi_pci_disabled || !bus->bridge)
+	if (acpi_pci_disabled || !bus->bridge || !ACPI_HANDLE(bus->bridge))
 		return;

 	acpi_pci_slot_enumerate(bus);